[time-nuts] Best counter setting for ADEV?

Bob Camp lists at rtty.us
Thu Oct 4 14:25:32 UTC 2012


Hi

For a *resolution* of 1.0 x 10^-14 at 1.0 x 10^5 seconds I only need a 1.0 x
10^-9 second reading out of the counter. Indeed, 5 or 10X more than that
would be better if I was after a 1 x 10^-14 accuracy. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Thursday, October 04, 2012 7:58 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best counter setting for ADEV?

Taking 10 samples from a 1nS counter leads you to a 100pS resolution but
the noise at best (if it is really random) is reduced by SQRT(10). So, as
already pointed out here, there is no real substitute for lower noise,
higher resolution measurements.

On Thu, Oct 4, 2012 at 3:01 AM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> A 1 ns resolution TI counter will do the measuring part just fine. Hitting
> the number, is where it gets a bit crazy. A *good* GPSDO might get near
> that.
>
> Bob
>
> On Oct 3, 2012, at 8:56 PM, Kevin Rosenberg <kevin at rosenberg.net> wrote:
>
> > On Oct 3, 2012, at 6:52 PM, Kevin Rosenberg <kevin at rosenberg.net> wrote:
> >> Nice plot! Yes, I'd have trouble measuring 10E-14 at 10E5 seconds.
> >
> > Sorry, 1E-14 at 1E5.
> >
> >
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